Question

VA ROG OFER 15 PUNCTE LA DOUA INTREBARI LA MATEMATICA va rog 
1 Rezolvati ecuatiile in multimea indicata.
a) 1/3:(2x-1)=2
b) 5/4·(x-3,1)=15/8

2 Rezolvati in Q ecuatiile:
a) 2,5x+3=9,75
b) 0,25·x+1=1,5
c) 2x-1,4=2,5
d) 0,(2)x+0,5=0,75

Answer 1

1.
a. 2x-1=2*3
2x=7
x=7/2=3.5
b. x-3.1=15/8*4/5
x-3.1=3/2
x=1.5+3.1=4.6
2.
a 2.5x=6.75
x=6.75/2.5
x=2.7
b. 0.25x=0.5
x=0.5/0,25
x=2
c.2x=3.9
x=3.9/2
x=1.95
d. 0,(2)x=0.25
2/9x=1/4
x=9/8